// FindWhitespace
bool COpcTextReader::FindWhitespace(COpcText& cToken)
{
OPC_ASSERT(m_szBuf != NULL);
OPC_ASSERT(m_uLength != 0);
UINT uPosition = 0;
// skip leading non-whitespace
if (cToken.GetSkipLeading())
{
for (UINT ii = 0; ii < m_uEndOfData; ii++)
{
if (CheckForHalt(cToken, ii))
{
return false;
}
if (iswspace(m_szBuf[ii]))
{
uPosition = ii;
break;
}
}
}
// check if there is still data left to read.
if (uPosition >= m_uEndOfData)
{
return false;
}
// read until a non-whitespace.
for (UINT ii = uPosition; ii < m_uEndOfData; ii++)
{
if (CheckForHalt(cToken, ii))
{
break;
}
if (!iswspace(m_szBuf[ii]))
{
break;
}
}
// check for empty token
if (ii == uPosition)
{
return false;
}
// copy token.
CopyData(cToken, uPosition, ii);
return true;
}
// FindLiteral
bool COpcTextReader::FindLiteral(COpcText& cToken)
{
OPC_ASSERT(m_szBuf != NULL);
OPC_ASSERT(m_uLength != 0);
LPCWSTR szText = cToken.GetText();
UINT uLength = (szText != NULL)?wcslen(szText):0;
// check for trivial case
if (uLength == 0)
{
return false;
}
UINT uPosition = SkipWhitespace(cToken);
// check if there is enough data.
if (uLength > (m_uEndOfData - uPosition))
{
return false;
}
for (UINT ii = uPosition; ii < m_uEndOfData-uLength+1; ii++)
{
// check if search halted.
if (CheckForHalt(cToken, ii))
{
return false;
}
// compare text at current position.
if (IsEqual(cToken, m_szBuf+ii, szText, uLength))
{
CopyData(cToken, ii, ii+uLength);
return true;
}
// stop search if leading unmatching characters are not ignored.
if (!cToken.GetSkipLeading())
{
break;
}
}
return false;
}
